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Moles and Molar Mass

AP Chemistry· difficulty 3/5

How many H₂O molecules are in 18 g of water?

  • A

    6.02×10236.02 \times 10^{23}

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  • B

    11

  • C

    18×6.02×102318 \times 6.02 \times 10^{23}

  • D

    3.01×10233.01 \times 10^{23}

Explanation

18 g / 18 g·mol⁻¹ = 1 mol; 1 mol × NAN_\text{A} = 6.02×10236.02 \times 10^{23}.

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